Hornby High School is a state coeducational secondary school located in the western Christchurch, New Zealand suburb of Hornby.

The school opened in February 1975 to serve the growing Hornby area.

The permanent classroom blocks were supposed to be ready for the first intake of 240 Form 3 (now Year 9) students, but delays within the Treasury and Ministry of Works saw the completion date pushed back to early 1976.

As a temporary solution, the Canterbury Education Board constructed twelve CEBUS relocatable classroom blocks[nb 1] at the eastern end of the school site.

Most of the CEBUS classrooms are still present at the school, alongside the permanent S68 classroom blocks typical of 1970s-built New Zealand state secondary schools.